"Ten-Tails" (十尾, Jūbi) is chapter 610 of the original Naruto manga.
Shocked to the see the Ten-Tails before them, Naruto surmises that they must have been tricked as he was unable to sense the Demonic Statue of the Outer Path's malevolent chakra. However, Kurama tells the young man that it was impossible to sense the beast in the Tailed Beast Mode as the beast had neither feelings nor ideals and was akin to natural energy and that using Sage Mode to sense how powerful it was, would be a different matter. Meanwhile, Obito and Madara relocate atop the beast and attach themselves to it. Obito notes that he would like to commence the plan immediately, but Madara is more in favour of testing out the beast's power. As Naruto's attempt to gauge the Ten-Tails' power in Sage Mode ends in Naruto realising that it was indeed truly immeasurable, Kurama asks Gyūki to hand him Might Guy and Kakashi so he could restore their chakra. Taking command, Kurama devises a battle strategy to face the beast launching a continuous stream of Tailed Beast Balls, which culminates with Gyūki seemingly being decimated by the Ten-Tails' Tailed Beast Ball, but it was later revealed that Kakashi had warped it away while being launched by Naruto along with the latter's clone overhead the Ten-Tails where Kakashi released Gyūki who was aiming a Tailed Beast Ball right at the giant beast.